<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="../../assets/css/bootstrap.min.css">
    <style>
        .container-fluid {
            padding: 0;
        }
        .bd-example {
            position: relative;
            padding: 1.5rem;
            margin-right: 0;
            margin-left: 0;
            border: .2rem solid #1887E0;
        }
        iframe {
            padding-top: 20px;
            width: 100%;
            height: 300px;
        }
    </style>
</head>

<body>
    <div class="container-fluid">
        <fieldset class="bd-example">
            <legend>示例 B</legend>
            <div>
                <label for="b_text">text B: </label>
                <input type="text" name="b_text" id="b_text">
            </div>
        </fieldset>
    </div>
    <iframe src="./c.html" frameborder="0" scrolling="no"></iframe>
</body>

</html>